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PostPosted: Mon Oct 25, 2021 12:04 am 
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Joined: Sun Oct 24, 2021 11:35 pm
Posts: 1
Hey everyone. First post so let see how we go...

I'm fitting LED headlights into my 260c, these have a combined low and high beam function with a H4 plug. However I can't quite figure out the wiring in the car.

I've tried almost everything, I've put a multimeter on every headlight wire and I'm just stuck.

With the headlights on low, every wire reads about 12v. High beam, same story.
The LEDs use the same H4 plug but with different positions for ground, high and low. I removed them out of the plug and put them onto the respective pins on the LED.

All I get is high beam on the low setting, I tried swapping the wires around (except the ground) with no luck.
When I switch to high beam. It shuts off completely.

The 260c has 4 headlights. 2 high low sealed beams and 2 supplementary high beams. When the LED shuts off when high beam is selected, the supplementary high beam on that side doesn't come on either...

Does it do something weird and switch polarity when high beam is on? I haven't a clue. But any help is appreciated!


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